fix(vsftpd): limit to 10 pasv ports

Dockerfile

@@ -13,5 +13,5 @@ COPY [ "/src/docker-entrypoint.sh", "/" ]
 
 CMD [ "/usr/sbin/vsftpd" ]
 ENTRYPOINT [ "/docker-entrypoint.sh" ]
-EXPOSE 20/tcp 21/tcp 40000-50000/tcp
+EXPOSE 20/tcp 21/tcp 40000-40009/tcp
 HEALTHCHECK CMD netstat -lnt | grep :21 || exit 1

src/vsftpd.conf

@@ -28,7 +28,7 @@ max_clients=0
 max_per_ip=0
 pasv_enable=YES
 pasv_address=0.0.0.0
-pasv_max_port=50000
+pasv_max_port=40009
 pasv_min_port=40000
 port_enable=YES
 ftp_data_port=20